The Melt Flow Index Tester MI-3 enables to measure the melt-flow-rate (MFR) and the melt-volume-rate (MVR) with a semi-automatic instrument. It can carry out a single weight test according to ISO 1133 and ASTM D1238 procedures B, as well as ISO 1133 and ASTM D1238 Procedure C for the “Half Height/Half Diameter” standard. It also has a high resolution position sensor with an automatic selection of the resolution which allows a repeatable and reliable measurement of MFR and MVR.